Results 161 to 170 of about 1,563 (196)

Properties of hydroxyl‐terminated polybutadiene‐urethane systems

Journal of Applied Polymer Science, 1971
AbstractThe properties of liquid hydroxyl‐terminated polybutadiene (HTPB) stocks crosslinked with isocyanates of different functionalities were intensively investigated. The stocks were modified by inclusion of small proportions of various low molecular weight diols to increase the urethane concentration. The following studies were carried out: (1) the
John P. Consaga, David M. French
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Combinations of hydroxyl‐terminated polybutadiene and boron

Journal of Polymer Science: Polymer Chemistry Edition, 1985
AbstractMixing and curing experiments with suspensions of boron in hydroxyl‐terminated polybutadiene (HTPB) have been performed. In kneading experiments on a plastograph very high viscous masses with bad curing properties were obtained. The experiments indicated that HTPB is attached with its OH groups to acidic impurities on the surface of the boron ...
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Terminal functionalized hydroxyl‐terminated polybutadiene: An energetic binder for propellant

Journal of Applied Polymer Science, 2009
AbstractWe report the functionalization of hydroxyl terminated polybutadiene (HTPB) backbone by covalently attaching 1‐chloro‐2, 4‐dinitrobenzene (DNCB) at the terminal carbon atoms of the HTPB. The modification of the HTPB by the DNCB does not alter the unique physico–chemical properties and the microstructure of the parent HTPB.
Rajavelu Murali Shankar, Tapta Kanchan Roy, Tushar Jana   +2 more
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Synthesis and characterization of terminally functionalized and epoxidized hydroxyl-terminated polybutadiene

Polymer Bulletin, 2011
Pyridyl N-oxide derivatives of hydroxyl terminated polybutadiene-pyridine (HTPB-PY) were synthesized via functionalization on terminal carbon atoms of HTPB backbone by 2-chloropyridine and epoxidation of C=C bonds and N atoms using in situ generated dimethyl dioxirane (DMD).
Mir Mohammad Alavi Nikje, Hassan Hajifatheali   +1 more
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Polyurethane based on hydroxyl‐terminated polybutadienes

British Polymer Journal, 1971
AbstractButadiene has been found to homopolymerise and copolymerise with other reactive vinyl monomers to yield unique liquid polymers which are terminated with reactive allylic hydroxyl groups. Through the use of an isocyanate cure reaction they offer a route to liquid castable general purpose elastomers, capable of reinforcement with various fillers ...
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Functionality distribution and crosslink density of hydroxyl‐terminated polybutadiene

Polymer International, 1993
Abstract A novel approach is proposed for estimating the average molecular weight between crosslinks (M̄ c ) from the functionality distribution of hydroxyl‐terminated polybutadiene ( HTPB ). The functionality distribution of four free‐
K. N. Ninan, V. P. Balagangadharan, K. Ambikadevi, K. B. Catherine   +3 more
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Urethane Elastomers Based on Hydroxyl Terminated Polybutadienes

Journal of Elastoplastics, 1971
This article describes the preparation and properties of urethane elastomers based on hydroxyl-terminated polybutadienes. The liquid nature of these polybutadiene systems allows easy reaction with isocyanates even at ambient temperatures. Properties of elastomers produced can be easily improved by either chemical modification of the polymer backbone of
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Catalysis of Blocked Isocyanate-Hydroxyl-Terminated Polybutadiene Cure Reaction

Journal of Macromolecular Science, Part A, 1996
The catalytic activity of three tertiary amines and three organotin compounds in the cure reaction of blocked isocyanate with hydroxyl-terminated polybutadiene was investigated. It was found that the steric factor determines the catalytic activity of the compound. The tin compounds showed higher catalytic activities than the amine compounds.
H. Kothandaraman, A. Sultan Nasar, K. R. Suresh   +2 more
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Preparation of Hydroxyl-Terminated Polybutadiene with High Cis-1,4 Content

Industrial & Engineering Chemistry Research, 2014
Hydroxyl-terminated polybutadiene (HTPB) with high cis-1,4 content (>95.0%) has been prepared via a two-step method by taking commercial butadiene rubber (BR9000) as a starting material, including the one-pot synthesis of aldehyde-group-terminated polybutadiene (ATPB) in high efficiency and the subsequent reduction reaction.
Qinzhuo Zhou, Suyun Jie, Bo-Geng Li
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Viscoelastic behavior of hydroxyl terminated polybutadiene containing glycerin

Journal of Applied Polymer Science, 2011
AbstractHydroxyl terminated polybutadiene (HTPB) is widely used as a propellant binder. A plasticizer is usually added to improve the processing properties, the mechanical properties, and the burning characteristics of the propellant. Glycerin was found to be an effective additive to improve these properties.
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